-aaa- aaaee aabaa aabba aabra aarau abaab ababa ababe ababu abaer abara abare abaru abbar abbou abbur abear abeau abeba abebe abeer abera abere aberr aboab abobo abora abore aboue abrar abreu abura aburr aeaea aebbe aereo aero- aeroe aerru aoure ar-ab arab- araba arabe arabo araea arara arare araru arbab arbar arbee arber arbor arbre areae arear areo- arere arero aroab aroar aroba arobe aroer aroor arora arore arrau arrea arroe arrou arrua aruaa aruba arura aruru auber aurae aurar aurea auro- auroa auror aurra baabe babar babau babee baber baboo babou babra babur baoro baraa barab barao barar barba barbe barbu barea bareo barer baro- baroa baroo baror barra barre barro barru barua baubo bauer baura baure bauru bbbee bbear be-er be-ro beara beare bebar beber bebra beebe beour berar berau berba berbe berea berob beroe beror berra berre berru beuer beure bo-bo boaro bobar bobea bobr bobre boero boeur booba booer boora boore booru borau borba borbo borea boree borer boro- boroa boroo borou borra borre borro bouar bouba bouee bouer boura boure breba brebu breer breo- brera brere breu- brobo broer brora broue brrar brrrr bruer bubba bubbe buber buraa burao burea buroo burra burro burru earar earou ebara ebber eboue ebure eeeee eorre erbaa erbar erbbe erber erear erere eroor erora erore error eubro euro- euroa eurre o-r-b oarer oaror obaba obara obora oboro oboue obrab obreb oo-er ooooo oraba oraea orara orare orbea orear oreo- orera orere orero orobe orobo oroer oroua orube oruro ouara ouera ouoro ourba oure- ourea ra-ra raaba raabe raaor rabab rabba rabbe rabor rabou rarae rareb raree rarer rear- reaue rebab rebar rebbe reber rebra reere rere- reree rerob reuar reuer ro-ro roabe roaue robab robar robbe robbo rober robo- robor robur roera roero rooba rooer roore rooue rorbu rorer rorra rouba rouer roura roure rubab rubba rubee ruber rubor rubra ruere uaroo uber- ubobo uouee uraba urare urbar urea- ureae ureo- urera uroob urour urrao urrea urubu uuuuu